The Digestive System
We need food for cellular utilization:
!nutrients as building blocks for synthesis
!sugars, etc to break down for energy
most food that we eat cannot be directly used by the
body
!too large and complex to be absorbed
!chemical composition must be modified to
be useable by cells
digestive system functions to altered the chemical and
physical composition of food so that it can be
absorbed and used by the body; ie
Functions of Digestive System:
1. physical and chemical digestion
2. absorption
3. collect & eliminate nonuseab